RFR: 8334421: assert(!oldbox->is_unbalanced()) failed: this should not be called for unbalanced region

[Vladimir Kozlov]

[JDK-8324969](https://bugs.openjdk.org/browse/JDK-8324969) changes was not complete. When Escape Analysis tries to determine if lock can be eliminated it looks only if corresponding object does not escape. I does not take into account if coarsening locks elimination already happened and created unbalanced regions.

Added check that not-escaped object is not referenced from an unbalanced region before marking or eliminating corresponding locks.

Dump additional information for coarsened locks when debugging.

New regression test was added

Tested tier1-5,stress,xcomp

-------------

Commit messages:
 - 8334421: assert(!oldbox->is_unbalanced()) failed: this should not be called for unbalanced region

Changes: https://git.openjdk.org/jdk/pull/19870/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19870&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334421
  Stats: 235 lines in 6 files changed: 231 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19870.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19870/head:pull/19870

PR: https://git.openjdk.org/jdk/pull/19870